Low Form Borosilicate Glass Weighing Bottle with Ground Stopper Capacity:20mL Labradorite hand sample measures 3

Labradorite hand sample measures 3 inches with dark plagioclase feldspar displaying iridescent blue-green labradorescence optical effect for mineralogy teaching

sized as a stable workspace for balance

Chert hand sample measures 3 inches with microcrystalline quartz texture and conchoidal fracture for cryptocrystalline silica mineral identification

Determines organic-compound melting points by providing uniform convective heating of a suspended sample in a borosilicate glass Thiele tube during qualitative organic analysis

Low Form Borosilicate Glass Weighing Bottle with Ground Stopper Capacity:20mL Labradorite hand sample measures 3Seals samples against atmospheric moisture uptake during analytical balance weighings, with a ground glass interchangeable stopper sized for quantitative workflows.